Thanks for the suggestion. Yeah, I tried to disable LTE too, but the same problem persists. It's certainly a strange one.I just tested on an even older phone like the ZTE Axon 7 and it works! So it's a problem specific to the S9+. Total head scratche...
@FelineZoo @Lloyd5 did you guys ever get the problem solved? I signed up for a Public Mobile line for my son, gave him my Galaxy S9+ and he's having the exact same problem. Calls from our mobile numbers work, but calls from our home Telus landline, a...